If we believe in love at first sight, then we naturally experience this ourselves. It's kind of like a self-fulfilling prophecy: So it's basically that we meet a new guy, we like him, we think we could even love him although we barely know him, and then boom, suddenly we're convinced we're falling for him. Maybe we really do care about him, maybe we don't, but either way, we're falling for the whole love at first sight idea and we're falling fast and hard.